You discover an impact crater that is 10 kilometers across. Which of the following can you conclude?
A) It was created by the impact of an object about 10 kilometers across.
B) It was created within the past 10 million years.
C) It was created within the past 1 billion years.
D) It was created by the impact of an object about 1 kilometer across.
D
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Degeneracy pressure is the source of the pressure that stops the crush of gravity in all the following except
A) a brown dwarf. B) a white dwarf. C) a neutron star. D) a very massive main-sequence star. E) the central core of the Sun after hydrogen fusion ceases but before helium fusion begins.
A 2.65-kg block of ice is at STP (0°C, 1 atm) while it melts completely to water. What is its change in entropy? (For ice, Lf = 3.34 × 10^5 J/kg)
a. zero b. 1 620 J/K c. 811 J/K d. 3 240 J/K e. 6 480 J/K
The absorption of an infrared photon that excites an atom to emit a green photon
A) occurs in plants. B) occurs in the process of phosphorescence. C) would violate the law of energy conservation. D) all of the above E) none of the above
The mean free path of air molecules at room temperature and atmospheric pressure is about:
A. 10?3 m B. 10?5 m C. 10?7 m D. 10?9 m E. 10?11 m